Uncontrollable Growth

The target of this spell has its size increase at 25% per round. They get all the normal bonuses and penalties for increased size, and, at first, this seems to be a good thing.

However, the target doesn't stop growing. Once they reach 300% of their original size (3 times their size), they stop cold, the increase suddenly becoming very painful. Then, they burst, their skin tears and they explode in morbid shrapnel (no mechanical effect, but eeeeeewwww...).

Before this point, they may endure other difficulties...someone trapped in a small hole may end up being crushed long before they reach maximum size. Likewise, this tears armor and rips through clothes, and makes normal-sized weapons difficult to wield with any effect (try wielding a toothpick like a spear, and you'll get a sense of it).

Even after death, their bones continue to grow, but at a highly reduced rate (50% per day), which could cause other effects if not stopped (imagine what happens when a giant arm pushes through a farmer's field...and keeps sprouting through the ground, as if something is rising out of the soil...).

Before they reach that point, a Fort save reduces the growing rate to 10% per round, giving them more time (though not much) to find a cure. This spell can be undone permenantly with Dispel Magic but spells that heal conditions (such as Heal and it's ilk) do alieviate the condition for a round, and return the target to their original size. 60 seconds later, they start growing again.

Truly, the power of Positive Energy is not something to be taken lightly...